Ebola Death Toll Reaches 660, Doctor Contracts Virus

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The death toll in West Africa's Ebola outbreak has risen to 660, with the number of cases surpassing 1,000, the World Health Organization said Friday. The grim toll was reported two days after other sad news surfaced that a key doctor treating patients with the disease had contracted the disease himself.

WHO spokesman Paul Garwood said that the extent of what is the deadliest outbreak of Ebola on record was still emerging.

"This is a trend, an overall picture. It's hard to get an exact picture on the scale of the situation at the moment," he told reporters.

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The UN health agency said 28 news deaths were recorded between July 18 and July 20. Thirteen were in Sierra Leone, 11 in Liberia and four in Guinea, which had previously borne the brunt.

Forty-five new cases were recorded over the same period, in West Africa's first-ever Ebola outbreak. That lifted the total number of laboratory-confirmed, probable or suspected cases of Ebola in the region to 1,093.

Liberia reported 28 new cases, lifting its total to 224. Of those, 127 have been fatal. Although Guinea recorded the lowest number of new cases -- five -- it is still has the highest death toll. In total, Guinea has seen 314 fatalities and 415 cases and since the outbreak began in January.

Sierra Leone's case-count has now overtaken Guinea's, however. It reported 12 new cases, taking its total to 454, with 219 deaths.

On Wednesday Sierra Leone's government reported that its chief doctor in the battle against the deadly virus, Sheik Umar Khan, had contracted the disease, himself. Medical staff and hygiene workers, even clad from head to toe in protective clothing, are among those most at risk. Khan had treated more than 100 patients with the disease and had been hailed a national hero.

How Can Ebola Be Stopped?

Ebola is a form of hemorrhagic fever which can have a 90-percent fatality rate.

It can fell victims within days, causing severe fever and muscle pain, vomiting and diarrhea -- and in some cases, organ failure and unstoppable bleeding.

It is believed to be carried by animals hunted for meat, notably bats.

It spreads among humans via bodily fluids including sweat, meaning you can get sick from simply touching an infected person. With no vaccine, patients believed to have caught the virus must be isolated to prevent further contagion.

The WHO, local medical services and international charities have been working flat-out to discourage communities from continuing funeral rights that involve touching dead bodies.

Ebola first emerged in 1976 in what is now the Democratic Republic of Congo, and is named after a river there.